Undercarriage for a power machine

Abstract

This disclosure is related to undercarriages for power machines that have tracks as tractive elements. In some embodiments, an adjustable idler mounting structure for an idler pulley in a track assembly is disclosed. In other embodiments, a roller mounting structure for attaching a roller to a track frame is disclosed. In yet other embodiments, an idler pulley is disclosed.

What is claimed is: 
     
         1 . A roller assembly for use in a track assembly of a tracked power machine, the roller assembly comprising:
 a roller configured to engage a track of the power machine;   at least one roller mounting structure configured to couple the roller to a track frame of the power machine, the at least one roller mounting structure including a mono-leaf spring having an aperture through which the roller is attached to the mono-leaf spring.   
     
     
         2 . The roller assembly of  claim 1 , wherein the roller mounting structure includes a second mono-leaf spring having an aperture through which the roller is attached to the second mono-leaf spring. 
     
     
         3 . The roller assembly of  claim 2 , wherein the mono-leaf spring and the second mono-leaf spring of the roller mounting structure form a pair of mono-leaf springs and are disposed on opposing sides of the roller. 
     
     
         4 . The roller assembly of  claim 1 , and further comprising multiple rollers configured to engage the track of the power machine. 
     
     
         5 . The roller assembly of  claim 1 , wherein the roller mounting structure includes a fastener configured to be accepted in the aperture of the mono-leaf spring to attach the roller to the mono-leaf spring. 
     
     
         6 . The roller assembly of  claim 1 , wherein the mono-leaf spring is a parabolic mono-leaf spring. 
     
     
         7 . The roller assembly of  claim 1 , wherein the mono-leaf spring is a tapered spring ending in the aperture through which the roller is attached to the mono-leaf spring. 
     
     
         8 . The roller assembly of  claim 1 , wherein the mono-leaf spring includes at least one frame mounting aperture extending from a first major surface of the mono-leaf spring to a second major surface of the mono-leaf spring to accept fasteners for attachment of the roller assembly to a track frame structure. 
     
     
         9 . A track assembly for a tracked power machine, the track assembly comprising:
 a track frame;   a track; and   a roller assembly coupled to the track frame, the roller assembly including:
 a roller configured to engage the track; 
 a roller mounting structure configured to couple the roller to the track frame, the roller mounting structure having a mono-leaf spring to which the roller is attached. 
   
     
     
         10 . The track assembly of  claim 9 , wherein the roller mounting structure includes a second mono-leaf spring to which the roller is attached, the mono-leaf spring and the second mono-leaf spring of the roller mounting structure forming a pair of mono-leaf springs disposed on opposing sides of the roller. 
     
     
         11 . The track assembly of  claim 10 , and further comprising a plurality of rollers configured to engage the track. 
     
     
         12 . The track assembly of  claim 10 , and further comprising a plurality of roller assemblies coupled to the track frame. 
     
     
         13 . The track assembly of  claim 9 , wherein the roller mounting structure includes a fastener configured to be accepted in an aperture of the mono-leaf spring to attach the roller to the mono-leaf spring. 
     
     
         14 . The track assembly of  claim 9 , wherein the mono-leaf spring is a parabolic mono-leaf spring. 
     
     
         15 . The track assembly of  claim 9 , wherein the mono-leaf spring includes at least one aperture extending from a first major surface of the mono-leaf spring to a second major surface of the mono-leaf spring, the track assembly further comprising at least one fastener extending through the at least one aperture to attach the roller assembly to the track frame. 
     
     
         16 . A power machine, comprising:
 a frame;   a track assembly coupled to the frame for providing tractive effort to cause the power machine to move over a support surface, including:
 a track frame; 
 a track capable of movement about the track frame; 
 an idler in communication with the track to provide tension to the track; and 
 an adjustable mounting structure coupled to the track frame and the idler for supplying tension to the track via the idler, wherein the adjustable mounting structure includes:
 a cylinder with a two-piece rod with a first portion of the rod capable of accepting a portion of a second portion, the second portion being coupled to the idler and moveable within and with respect to the first portion; and 
 a spring member acting against the first portion and the second portion. 
 
   
     
     
         17 . The power machine of  claim 16  and further comprising:
 a roller assembly mounted to the track frame for engaging the track, the roller assembly having a roller and a roller mounting structure coupled to the coupled to the track frame and the roller, the roller mounting structure including a mono-leaf spring. 
 
     
     
         18 . The power machine of  claim 17 , wherein the roller mounting structure of the roller assembly includes a second mono-leaf spring, the mono-leaf spring and the second mono-leaf spring forming a pair of mono-leaf springs disposed on opposing sides of the roller. 
     
     
         19 . The power machine of  claim 17 , wherein the track assembly includes a plurality of roller assemblies. 
     
     
         20 . The power machine of  16 , wherein the idler has a radius that joins an idler flange edge with an idler rolling face.